The marketing manager of a supermarket chain would like to determine the effect of shelf space on the sales of pet food. A random sample of 10 stores was selected, and the results are presented below
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
The marketing manager of a supermarket chain would like to determine the effect of shelf space
on the sales of pet food. A random sample of 10 stores was selected, and the results are presented
below.
| Store | shelf space in cm | weekly sales in thousand pesos |
| 1 | 45 | 18 |
| 2 | 45 | 21 |
| 3 | 75 | 15 |
| 4 | 80 | 18 |
| 5 | 95 | 23 |
| 6 | 100 | 26 |
| 7 | 135 | 22 |
| 8 | 140 | 27 |
| 9 | 185 | 25 |
| 10 | 190 | 28 |
d. Using the estimated simple linear regression equation Y=15.6414+0.0611X, estimate the weekly sales when the
shelf space is 230cm? 250cm?
e. Compute the coefficient of determination and interpret its value.
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